package com.hmdp.service.impl;

import com.hmdp.dto.Result;
import com.hmdp.entity.SeckillVoucher;
import com.hmdp.entity.VoucherOrder;
import com.hmdp.mapper.VoucherOrderMapper;
import com.hmdp.service.ISeckillVoucherService;
import com.hmdp.service.IVoucherOrderService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisIdWorkers;
import com.hmdp.utils.UserHolder;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.time.LocalDateTime;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {
    @Resource
    private ISeckillVoucherService seckillVoucherService;
    @Resource
    private RedisIdWorkers redisIdWorkers;
    @Override
    public Result seckillVoucher(Long voucherId) {

        //查询优惠卷
        SeckillVoucher voucher = seckillVoucherService.getById(voucherId);
        //判断秒杀时间
        if(voucher.getBeginTime().isAfter(LocalDateTime.now()))
            return Result.fail("秒杀尚未开始");
        //判断秒杀是否结束
        if(LocalDateTime.now().isAfter(voucher.getEndTime()))
        {
            return Result.fail("秒杀已结束");
        }
        //判断库存是否充足
        if(voucher.getStock() < 1)
        {
            return Result.fail("库存不足");
        }
//        //扣减库存
//        voucher.setStock(voucher.getStock() - 1);
//        //创建订单
//       seckillVoucherService.updateById(voucher);
        boolean success = seckillVoucherService.update()
                .setSql("stock = stock - 1")
                .eq("voucher_id", voucherId)
                .gt("stock", 0)
                .update();
        if(!success)
        {
            return Result.fail("库存不足");
        }
        VoucherOrder order = new VoucherOrder();
        long orderId = redisIdWorkers.nextId("order");
        order.setId(orderId);
        order.setUserId(UserHolder.getUser().getId());
        order.setVoucherId(voucherId);
        save(order);
        return Result.ok(orderId);
    }
}
